Created attachment 154510 [details]
would be nice to have the GtkScale transparencyslider widget from sidebararea.ui and sidebarshadow.ui also available in core/svx/uiconfig/ui/sidebarline.ui file.
Created attachment 154511 [details]
harmonize color picker
In the Sidebar -> property -> area there are different fill options
In all Options you see in the color picker widget the color + color name like Light Gold 2, Dark Gold 2, ... this is very usefull cause you don't have to open the widget and see in the tooltip which color you use for an shape.
In all Options you see color + color name, only at Fill Style Color you can't see the label for an fast review on an shape color.
please use the widget from Fill: Gradient for Fill: Color so that it's easier to know the label (if there is no label the #4d4d4d number was shown, what is also fine)
Also in Sidebarline.ui file the Color item should use the Color + Label widget.
+1, don't see any show stopper